It depends on when the meter on your phone was counting from. Make sure the dates are consistent.

It's tougher to get an exact amount of data use for a particular time frame on prepaid because boosters don't expire, so the amount used that shows on the booster could be from 2 weeks, 2 months, etc. And the chart built into the phone can't account for that. The booster usage in Self Serve is taken as correct.

That is not a problem Jonathan, I can adjuste the period of the meter. From what I observe, when I use the mobile Internet, my booster goes down a little bit more than reality and later on it is adjusted.